Question

If is right angled at C, then value of cos (A+B) is ______________

a) 0 b) 1

c) 1

2

d) not defined​

Answer 1

Answer:

Step-by-step explanation: A) 0

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Answer 2

Answer:

a)0

Step-by-step explanation:

angle A+angle B+angle C =180°

(sum of angles of triangle=180°)

angle A +angle B+ 90°=180° (angle C=right angle)

angle A +angle B=180-90

angle A +angle B=90°

since

cos(A+B)=cos(90°)

=0

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